Totally cool, awesome, the best.
Someone who is the leader, above all - higher power.
Someone who does something out of the ordinary that requires balls and is really cool, bold, almost impossible,
and just BOSS. Word popularized by Neil Patel, one who demostrated the meaning of "Boss" many times.

Yo, look at that guy over there man hes sooo BOSS!
Damn that watch looks Boss.
Thats a BOSS ride over there.
Wow, what he did was pretty Boss
Yo that shit is pretty Boss.
He gets all the bitches, he's such a Boss.